eio_open

(PECL eio >= 0.0.1dev)

eio_open — Opens a file

说明

resource eio_open ( string $path , int $flags , int $mode , int $pri , callable $callback [, mixed $data = NULL ] )

eio_open() opens file specified by path in access mode mode with

参数

path

Path of the file to be opened.

Warning

In some SAPIs(e.g. PHP-FPM) it could fail, if you don't specify full path.

flags

One of EIO_O_* constants, or their combinations. EIO_O_* constants have the same meaning, as their corresponding O_* counterparts defined in fnctl.h C header file. Default is EIO_O_RDWR .

mode

One of EIO_S_I* constants, or their combination (via bitwise OR operator). The constants have the same meaning as their S_I* counterparts defined in » sys/stat.h C header file. Required, if a file is created. Otherwise ignored.

pri

请求的优先级： EIO_PRI_DEFAULT ， EIO_PRI_MIN ， EIO_PRI_MAX 或 NULL 。如果是 NULL ，pri 将设为 EIO_PRI_DEFAULT 。

callback

callback 函数在请求完成时被调用。其应匹配一下原型：

 
void callback(mixed $data, int $result[, resource $req]);

data: 传递给请求的用户数据。
result: 针对请求的结果的值。通常是相应的系统调用返回的值。
req: 可选的请求资源，可被 eio_get_last_error() 之类的函数使用。

data

Arbitrary variable passed to callback.

返回值

eio_open() returns file descriptor in result argument of callback on success; otherwise, result is equal to -1 .

范例

Example #1 eio_open() example

  <?php
$temp_filename  =  "eio-temp-file.tmp" ;

 
 function  my_close_cb ( $data ,  $result ) {
  // Zero indicates success
     var_dump ( $result  ==  0 );
 @ unlink ( $data );
}

 
 function  my_file_opened_callback ( $data ,  $result ) {
  // $result should contain the file descriptor
     var_dump ( $result  >  0 );

    if ( $result  >  0 ) {
   // Close the file
         eio_close ( $result ,  EIO_PRI_DEFAULT ,  "my_close_cb" ,  $data );
         eio_event_loop ();
    }
}

 // Create new file for reading and writing
// Deny group and others to do anything with that file
 eio_open ( $temp_filename ,  EIO_O_CREAT  |  EIO_O_RDWR ,  EIO_S_IRUSR  |  EIO_S_IWUSR ,
   EIO_PRI_DEFAULT ,  "my_file_opened_callback" ,  $temp_filename );
 eio_event_loop ();
 ?>

以上例程的输出类似于：

bool(true)
bool(true)

参见

eio_mknod